Method of channeling shoe-soles



I e. M. PETTENGILL. METHOD OF CHANNELING SHOE SOLES;

APFL ICATION FILED APFLQ. 1919.

1,399,024, I Patentgd Dec. 6, 1921.

' Fig.1. Fly. 2.

IINVENTOAR WITNESSE$. ye fell/377.97],

TTORNEY UNITED STATES PAWTENT- OFFICE.

GEORGE M. PETTENGILL, OF.HAVERHIIiL,lllfASSACHUSETTS, ASSIGNOR 'ro HAM-EL :srron MACHINERY COMPANY, A coneona'rron or MASSACHUSETTS.

,mnirnon or cHANNEmNesHomsonEs.

. $pecification'of Letters Patent.

Patented Becki, 1921.

Application .flled Apri19, 1919. .Serial "No. 288,666.

[0 all whom it may concern:

Be it known that I, GEORGE MfPnrnnNorLL, a citizen of the United States, residiifi'g at Haverhill, in "the county of Essex and State oflllassachusetts, have invented certain new and useful {Improvements in M'e-th'ods of Channeling Shoe-Soles, of whichthe following is aspecification, reference being had therein tothe accompanying drawings.

In channeling a shoe .sole outwardly 'as is done in "the preparation of soles for turn shoes and insoles tforweltshDeS, much difficulty has been experiencedin properly perforiningthe operation at the point o'f asharp toe. It'has often been necessary to complete the operation'by hand after running through amachine, in order to prepare the channel at the apex for the sewing operation. Specially designed tools for use with :the machines have been devised in attempts to overcome this difliculty, but these have not been entirely successful, especially on the more extreme shapes.

The present invention provides a method by which the more pointed toes maybe channeled successfully without requiring the use of special tools and 'at .asingle operation.

For a more complete 'un'dertanding of the invention reference may be hadto'the accompanying drawings in which Figure 1 is a diagrammatic plan view of ashoe sole partly channeled, with the tool at the point of the toe'in position to channel one side of the sole after having channeled the other-side, as ordinarily done;

Figs. 2, '3, 4:, 5 and 6 are diagrammatic views illustrating the relative positions of sole and tool at various stages of the operation, according to thisinvention; and v Fig. 7 is a diagrammatic view illustrating the application 'ofthe invention to a power machinehaving a one-direction linear feed.

A represents the sole, and B the channeling tool. In Fig. 1 the sole is -represen1ted as having been channeled along the edge 1, tool B being at the apex of the 'toe in position to channel the side 2. The tool is ordinarily presented substantially normal to the line of the channel and in this position it is evidently necessary at the a ex of the toe to turn the tool sharply relative to the work, in order to go about the angle of the channel. 011 very sharp toes, however, there is no room for the shank of the tool to turn when the blade is pr j g n in cha nel a th point ofthe toe, any such turning of thetool resulting-in a'li'fting and tearing of the channel lip already formed, as illustrated at 3. This,of Course, spoils the continuity of the channel at the apex and makes it difiicult to guide the c'l'iannel guide of the sewing machine therein.

"In orderto overcome'this diiiiculty this invention provides for turning the tool :at either side or "the apex of the channel angle so that substantially no turning relative to the median line of the sole is required at the apex, "this-turningbeing accomplished where there is plenty ofroom therefor without danger of marri-ng the channel lip. lVhen the tool is inythe position illustrated in Fig. 2 it extends-substantially normal to the line of the channel at a as is usual. IOn approach ing the apex it is progressively made to assume an inclination toward the apex as at 6, Fig.3, asit nears the apex it occupies a position such as "shown at 0, 'Fig. 4, wherein the cutting "edge ofthe tool lies substantially parallel to a line "-bisecting the angle of the apex. Upon passing'the'apcx, the 'tool has imparted thereto a slight retracting move ment, and during or following this movement the tool is progressively inclined away from the apex, as seen at (Z, Fig. 5, the retraction of the tool "from the apex providing room for the "turningof the tool without interference withthe finished lip; This inclination proceeds until the tool has been brought into substantially normal position, as seen at c, Fig.6, after which the operation is completed in the usual manner. 'By this method, itis clear that substantially no turningo'f the tool tal're's place at the apex, such turning being accomplished as the tool approaches and recedes from the apex, thus avoiding damage-to the finished lip such as is occasioned by the common practice of turning the tool within the channel at the apex. I Inapplying this method to a power machine in which the sole is fed against the tool, the feed always being in the same linear direction, when the apex is reached and the sole must be reversed to work along the other side thereof, the tool must be moved with it. This is represented in Fig. 7 in which the straight arrow shows the constant direction of feed. The tool is first shown in position a substantially normal to the edge 1. As the apex is approached the tool is inclined thereloo toward as previously described, and when the apex is reached it is in the position 0, in the same manner as disclosed in Fig. 4. At this point the sole must be turned about the apex through the are m in order to channel side 2 thereof. As no relative turning motion of the tool and the sole is permitted at this time according to this method of operation, the tool also must be swung through a like angle m with the sole. This resulting position of the tool is shown at c, Fig. 7. The sole then continues to feed relative to the tool, and as the tool is retracted from the apex of the sole it is gradually turned in a position substantially normal to the edge 2, its final position being shown at the point e where it is in the same position as it was at the point a,in both cases extending substantially normal to the line of feed.

While this method has been described with reference to channeling of soles, it is evident that it might find equal applicability to other tools which operate within the channel,-for example, Gemming tools and the like, and this invention, is regarded as sufliciently broad to include all such operations.

' Having thus described the invention, what is claimed is, v y

1. The method of operating a. tool in a channel about an angle which consists in imparting to the tool a partial turning movement in such manner as to change the angle of presentation of its cutting edge to the work while operating upon one side of said angle, maintaining said angle of presentation substantially constant while passing the apex of such angle, and completing such turning movement while operating upon the opposite side of said angle. 1 y

2. The method of operating a tool in a channel about an angle which consistsin rel atively feeding the work against the tool edge while maintaining the angle of said edge to the median line of the work substantially constant in passing the channel angle.

3. The method of operating a tool in a channel about an angle which consists in relatively feeding the work to the tool edge and turning the edge with the work when feeding about the apex of said angle. y

4. The method of operating a tool in a channel about an angle which consists in relatively feeding the work to a tooledge and so turning said edge relatively to the work at one side of the apex of-said angle as to permit said edge and the-median line of the substantially constant in passing the apex of said angle.

6. The method of operating a tool in a channel about the inner side of an angle which consists in relatively feeding the work to the tool and inclining said tool toward the apex of said angle as it approaches said apex and away from said apex as it leaves said apex whereby substantial turning of the tool relatively tothe work at the apex may be avoided.

7. The method of operating a tool in a channel about an angle where the tool must be turned relative to the work, because of said angle, to be properly presented within the channel, which consists in effecting at least a portion of said turning at one side of the apex of said angle.

8. The method of channeling a shoe sole outwardly about a pointed toe which consists in relatively feeding the tool against the work toward the point on, one side, progressively inclining said tool toward said point as it approaches said point, channeling at the point with the tool pointing theretoward, withdrawing said tool from the point and progressively, incliningsaid tool in the reverse direction tochannel the opposite side of said sole as it is withdrawn.

, 9. The method of channeling a shoe sole outwardly about-a pointed toe which consists in feeding the work substantially normally against the tool to channel toward the toe along one edge of the sole, turning the tool relative to the work to incline it toward the point of the toeas it approaches said toe so that at the apex it points substantially directly theretoward, turning said sole together with said tool so that the sole is fed in a direction toI'channel along the opposite edge of said sole, and progressively turning said toolintosubstantially normal position relative to said feed as it recedes from the apex of said toe.

In testimony whereof, I have signed my name to this specification.

GEORGE M. PETTENGILL. 

